The work ____ be finished in such a short time .

A . wasn''t able to     B . couldn''t     C . ought      D . could

B


解析:

be able to 不接被動(dòng)語(yǔ)態(tài)。表示過(guò)去“能夠”，could 只能用于否定句，故 could 不正確。

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